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15% of $$x = \frac{15}{100} * x = \frac{3x}{20}$$
20% of $$y = \frac{20}{100} * y = \frac{y}{5}$$
Now, both are equal
=> $$\frac{3x}{20}$$ = $$\frac{y}{5}$$
=> $$\frac{x}{y}$$ = $$\frac{20}{5*3}$$
= 4 : 3
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